Q: Is 421,783 a Prime Number?
A: Yes, 421,783 is a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 421783 can be evenly divided by 1 and 421,783, with no remainder.
Since 421,783 can be divided by just 1 and 421,783, it is a prime number.